Furnace-grate for smokeless combustion.



No. 760,444. PATBNTED MAY 24, 1904. P. GIRTANNER. PURNAGE GRATB PoR sMoKfzLEss GOMBUSTION.

APPLICATION FILED DEO.1, 1902.

N0 MODEL. 6 SHEETS-SHEET 1.

@mik/flames 3110 P01.'

No. 760,444. PATBNTED MAY 24, 19n4.

' F. GIRTANNBR.

FURNAGB GRTE PoR sMoKELBsS GoMBUsTIoN.

APPLIUATION FILED DEU. 1I 1902.

N0 MODEL. 6 SHEETS-SHEET 2. Y

No. 760,444- I PATBNTBD MAY 24, 1904.

, F. GIRTANNBR.

FURNAGB GRATB FOR LSMOKELBSS COM-BUSTION APPLICATION FILED DBO.1, 1902.

N0 MODEL. SHEETS-SHEET 3.

1m; parus Patins on, Primo-uma., wAsumm'oN, nez

No. 760,444. PATENTEI) MAY 24, 1904. P. GIRTANNEB..

FURNAGE GRATE FOR SMOKELESS GOMBUSTION.

APPLICATION FILED DEU. 1, 1902.

F0 MODEL. 6 SHEETS-SHEET 4.

No. 760,44@ PATENTED MAY 24, 1904.

F. GIRTANNER.

FURNAGE GRATE FOR SMOKELESSGOMBUSTION.

APPLI-UATION FILED DBO. 1, 1902.

No MODEL. e SHEETS-SHEET 5.

NE Nonms nina co4. nuoro-UWB. WASHINGTON. u. c.

PATENTED MAY 24, 1904.

F. GIRTANNER. FURNACE GRATE FOR SMOKELESS GOMBUSTION.

APPLIUATION FILED DEO. 1, 1902.

6 SHEETS-SHEET 6.

N0 MODEL.

.tion-grate.

No. I760,444.

1 UNITED STATES Patented May 24, 1904-..

PATENT OEEICE.

FREDERICK GIRTANNER, OF NEI/V YORK, N. Y., ASSIGNOR TO THE UNITED STATES MINING t TRADING COMPANY,

OF NEW YORK.

A CORPORATION FURNAGE-GRATE FOR SMOKELESS GOMBUSTION.

SPECIFICATION forming part of Letters Patent No. 760,444, dated May 24, 1904.

Application filed Decemberl, 1902. Serial No. 133,401. (No model.)

To (1.7] whom it nrt/ty concern:

Be it known that I, FREDERICK GIETANNER, a citizen of the United States of America, residing at'the city of New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Furnace-Grates for Smokeless Combustion, of which the following is a specification.

My invention has reference to improvements in ugrates especially adapted for boilerfurnaces, and has for its object' essentially the combustion of bituminous or soft coal of the lowest grade without smoke and at the same time obtaining the highest possible efficiency.

To this end my invention consists, essentially, in a traveling distilling-grate having the individual grate-bars overlapping, so as to exclude ingress of air from below, an inclined combustion-grate adapted to receive the coked matter from the traveling distillinggrate, and a dumping-grate adapted to discharge the ashes. Y

My invention also consists in certain other novel features of construction, as will herein- `after be fully pointed out in connection with the annexed sheets of drawings, in which- Figure l represents a vertical section of a grate embodying my invention. Fig'. 2 is a side elevation of the same. Fig. 3 is afront View of Figs. l and 2. Fig. 4 is an enlarged perspective of a portion of the traveling distilling-grate. Fig.- 5 is a perspective view of a clearing-roll interposed between the traveling distilling-grate and the inclined combus- Figz is a side elevation of the hopper and its operating means for automatic stokers. Fig. 7 is a longitudinal section showing the grate applied to an internally-fired boiler. Fig. 7 Fig. 9 is a vertical section on the line 8 8, Fig. 7

Similar letters and numerals of reference same preferably being kept at a slight dis- Fig. 8 is a sectional end elevation of tance from the side walls, so as to permit easy removal for repairs. Upon the side frames are supported and arranged, first, a traveling distilling-grate B, secondly, a combustiongrate C. and, thirdly, a dumping-grate D, arranged in order from the exterior of the furnace. The traveling grate consists of a series of grate-bars arranged to overlap each other, as shown in Fig. l, and carried by conveyingchains l, passing over suitable chain-Wheels 2 2, arranged on opposite interior sides of the frame and mounted on parallel shafts 3 3. Motion is imparted to the outer shaft 3 by means of a small engine E, having' its pistourod e connected with a worin-shaft 4, engaging a worm-wheel 5, rigidly secured to the outer shaft 3, thus imparting a slow movement to the worm-Wheel 5 for gradually advancing the upper portion of the traveling distillinggrate B toward the combustion-grate O. The particular mechanism for producing a slow movement of the traveling distilling-grate B, either intermittent or continuous, forms no part of my present invention, as any wellknown mechanism for this purpose may be employed. The traveling distilling-grate has its grate-bars substantially in contact with each other at the overlapping portions, so as to permit practically little or no ingress of air from below to the mass of fuel thereon, air being admitted only from above through the opening or openings 7, through which the supply of fuel is introduced from the hopper F, into which the fuel is shoveled as usual in stoking apparatus, or supplied bya distributer.

In practice I provide the links 8 of the chains l with dovetail grooves 9 and the gratebars with longitudinal dovetails l0, adapted to lit thevdovetail grooves 9, so that the individual barscan readily be inserted or removed', While at the same time they are securely held to the chain while traveling.

The combustion-grate O is spaced from the distilling-grate B, and between the sameis arranged a clearing-roll I, provided with a corrugated or toothed surface, said roll being loosely `mounted upon a shaftand divided in the direction of its length into several sections e', each independent of the other. This roll has for its function to guide the coked fuel from --the traveling distilling-grate B to the combustion-grate C and to prevent clogging by crushing in conjunction with the grate-bars of the grate B any clinker or foreign substances which may not pass over to the grate Cas, for instance, clinkers may adhere to the grate-bars or slate or other matter may not pass over to the grate C, and in such an event such matter is crushed by the clearingroll I and drops to the bottom.` In my prior patent, No. 692,263, of February 4, 1902, the

traveling grate and the combustion-grate were locatedI close together and there was a liability of the two grates being clogged by substances entering between the two, thus stop- .-ping the movement of the traveling grate.

ith the use of the clearing-roll, as described,

this cannot happen, and consequently there is -no danger of the traveling grate being stopped.

The combustion-grate C is arranged at an incline in a position with its upper end adapted to receive. the colied fuel passing over the clearing-roll I and is composed of a series of :individual grate-bars overlapping each other with proper provision for the introduction of air from below through the ash-pit. Y

The dumping-grate D, adapted to remove the accumulating ashes, is hinged at CZ, to turn downwardly, and is operated from the eXtevrior by means of the rod K and arms d to remove all ashes passing from the Agrate C. This grate D may bemade solid or in the form of a usual grate.

The last or lowest member of the grate C,v

I use as an abutment for preventing discharge of fuel from the grate G when the grate D is;

dumped, the same being mounted to turn and is connectedwith a rod L, adapted to be operated from the exterior of the furnace for the purpose of turning the same upwardly into the position shown by dotted lines in Fig. l before the dumping-grate is turned downwardly, thus retaining the fuel in the grate C. This grate-bar may be made solid or perforated. y,

The hopper F is provided lwith a sliding gate f, having thereon a series of racks f", adapted to be engaged by gear-wheels f2, arrangedon the shaft j', and said shaft being provided with a ratchet-handle J for raising and lowering said gate for the Vpurpose of 4regulating the amount of fuel to theY travelwithout admission of air from below and at the ordinary coking temperature, the lire being kindled on this grate as usual; secondly, the coked matter which has received air only from above is passed to a second grate arranged for the ingress of air from below for the purpose of practically complete combustion, while the products of combustion from this second grate mix with the gasesproduced at a low temperature from the distilling-grate and effect in conjunction the complete com- -bustion of all gases at a high temperature, as

well as any fine particles of unconsumed carbon -or carbonaceous matter which might be carried off from either grate.

The inclined combustion-grate C may be composed of rocking grate-bars adapted to be turned to the positions shown by dotted lines in Fig. l by means of a usual rodM whilethe furnace is in operation,lor it may be turned to the position shown by full lines in Fig. l when the furnace is to have the fires banked.

IV hat I claim as new is- 1. A combination-grate for furnaces comprising a traveling distilling-grate having individual grate-bars overlapping so as to eX- clude ingress of air from below, and said grate being of sufficient length tocoke the fuel; an inclined combustion-grate adapted to receive the coked matter from the traveling distillinggrate and provided with air-openings between its bars, a dumping-grate adapted to receive ashes from the combustion-grate, and a gate intermediate of the combustion-grate and the dumping-grate for holding the fuel on the combustion-grate when the dumping-grate is actuated, substantially as described.

2. A combination-grate for furnaces comprising a traveling distilling-grate having individual grate-bars overlapping so as to`eX- clude ingress of air from below, and said grate being of sufhcient length to coke the fuel; an inclined combustion-grate adapted to receive the coked matter from the traveling distillinggrate and provided with air-openings between its bars, and a dumping-grate adapted to receive ashes from the combustion-grate, substantially as described.

3. A combination-grate for furnaces comprising a traveling distilling-grate closed sublIoo IIO

stantially to ingress of air from below the fuel-carrying surface and adapted to carry the fuel from the hopper through sullicient space to coke the fuel, a separate inclined combustion-grate adapted to receive the coked products from the distilling-grate and provided with air-openings, a dumping-grate adapted to receive ashes from the combustion-grate, and a clearing-roll intermediate of the distilling and combustion grates, substantially as described.

4. A combination-grate for furnaces comprising a traveling distilling-grate closed substantially to ingress of air from below the fuel-carrying surface, and adapted to carry the fuel from the hopper through sufficient space to coke the fueha separate inclined combustion-grate adapted to receive the coked products from the distilling-grate and provided with air-openings, a dumping-grate adapted to receive ashes from the combustion-grate, and a loosely-mounted corrugated clearing-roll intermediate of the distilling and combustion grates, substantially as described.

5. A combination-grate for furnaces cornprising a traveling distilling-grate closed sub stantially to ingress of air from below the fuel-carrying surface, and adapted to carry the fuel from the hopper through sufficient Space to coke the fuel, a separate inclined combustion-grate adapted to receive the colied products from the distilling-grate and provided with air-openings, a dumping-grate adapted to receive ashes from the combustion-grate, and a loosely-mounted clearingroll transversely divided and intermediate of the distilling and combustion grates, substantially as described.

6. A combination-grate for furnaces comprising a traveling distilling-grateclosed substantially to ingress of air from below the fuel-carrying surface, and adapted to carry the fuel from the hopper through suliicient space to coke the fuel, a separate inclined combustion-grate adapted to receive the eoked products from the distilling-grate and provided with air-openings, a dumping-grate adapted to receive ashes from the combustion-grate, and a loosely-mounted tubular` clearing-.roll intermediate of the distilling and combustion grates, substantially as described.

7. A traveling grate for furnaces comprising a series of grate-bars overlapping each other and adapted to come into contact one with the other for the purpose of closing offk ingress of air from below at the combustionsurface, substantiall5T as described.

8. A traveling grate for furnaces comprising a series of grate-bars overlapping` each other and adapted to come into contact one with the other for the purpose of closing off ingress of air from below at the combustionsurface, and side guards overlapping the ends of bars of the traveling distilling-grate, substantially as described.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

FREDERICK GIRTANNER.

Witnesses:

RAENA I-I. YUDIZKY, A. FABER DU FAUR, Jr. 

